Attachment plug



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\ ATTAGHMET PLUG.

--ygAppiicationi leamecember e3;'1916.- serial im;` 138;@47.

- allyabecome detaehed yBoth members may be made of any suitable non-conductingmaterialffsuch as' porcelain;harde-rubber or the lilrej' but as jshoWnMare-"of ag fornzi-Y enabling "l them tube-readily -Inoldfed from composition material Ato' reduce. the' cost In the form shown '-Figs. 1 to 3 1 the base "oirbody vindieatedat 1/is'a-shortsolid ey lind-rical piece vhaving f a reduced i threaded stein 2 on one-sidefand a countersuni; `thread- `ed-recess 3 `on its; other vside to receive a screw. 4*. passing? through the nend- Contact member 5.' The screw-can be readily mold- T @ZZ whom t may concern.'

f 4Be it know-nthat''; RobesonY vBri /VOLCOTT, citizen of thel 'United- @Statesyv resid-ing air `Cleveland. Heights ,filrlage,` -infthe ycounty of o Cuyahoga andfState noi? Ohio', :have invent-- "ed certainV new and-'useful yI-frnprovenient's in- 'Attachment "Plugs, of `which the following is a specication.

'This invention relates to swivelV attachnient plugs. Theobjectio the invention is* to provide a` simple, cheap attachment" plug "fwvhieh can be 1 easilyfconneoted to* the con-#- ducting Wires; Which' -has-=less-vpartsjthan`-- prior plugs'ofthistype; Whichthoroughlyfed vvlthrthefbodyduring itsormationand insulates the endend-isidecontacts topre-"then unscrewed;therefrom-leaving the `body vent'- shortV circuits or Vaccidental shock.` to threadsforined therein. At-onesideiotthe theuser; Whose end and side binding screwsrecess?, isp-an, openingthroughthe-stein2 to are both carried by the sainev piece and are l'eeeivethe Wire'IT-leadingtothe endl binding hence alwaysfin yfixed relation;- whose'nparts-fserew. are'of such orin as to be easily formed-by a cheap molding operation;- and` inally a plug which is Istrengl and durable and'no't liable to gety out of order.

Further objects'of' the nventionare inpart obviousandiin part will appear-more in detail hereinafter.

The invention `comprises the constructionand: arrangements ot parts hereinafter'described and claimed.

Inthe dravv'ingsr- Fig. l represents aside-- elevation oone :form offpluglfernbodying the inventiong'ig. 2 is aflongitudfinal-se 1extending in both-'dfireetions thereiromff-Its tion on the-line-glig. 1;Fig. 3 is aplanf freeends are bowed-0r'bent-outwardly roin View ofthebase or body g' Fig. l isa1ongi-`H'thereeess soastoextend@beyondy theylimits tudinal section 01.- another lvform of plug; ofV the body.""-Hence lwhenthe plugyis in-` Fig. 5 is a1perspeetive vievvo `the -side non-vi sertedii-nto-a'soeletF and orcedhoine `thegside ltact; Fig. 6 is aplan View otthebase or springcontactsfinakeelectrica-l Contact Wfith bodyg--andFig'L 7 is :longitudinahsection, I showing bindin terminaly connection #for r'eadily understoodf'lhefQpp'osite vfend#- of side Contact. the L=shaped portion V8--projectslongitudi- The plug shown ink the-drawings eoinpzeisesynallyfronr'the Vsteffi 1.2 and"isI'enlarged-rtoreessentially\two ,in,embers,to'-Wit a bases orffffv body Aand a threadedsocket`v engagi;nginerf'w ber -rotat'able :frelativefl thereto; 'These two -members-are suitably eonneetediin aimanner to be readily lidetacha-ble.I IwhenY desired, for 1" connecting or? disconnecting the lead -"'?Wire`s, butwhen eonnectediwi-llf-lnotraceident iied' by thelbase onbody -l-fand may also be attachedv--tllieretobA although--thi`s is notessential. As vshown-1s'aidl 'side' Contact comprises a metal` member'having'f an Lshaped porniaiuhbodyfand stein,` continuous-With :which is a spring-portionl() conforming to acireumferentiallyextending recess lll ofi; the l body; gSaid springfcontact portion -inay 4"eX- tion 8 secured by ascretv 9-in recessesiiin the tend inf-only i one direction circumferential-ly ifrom the L vshapedportionS but is shown as 1 ceivs, the'bindingfserew- 'lifter theetherlead "zlhe side contaetis-also supported'ory earthe; threaded shell oifthesoclret, as vwill be v l his member is made entirely ot nonconducting material and has no meta-l conducting parts attached thereto. It is, thereiore, cheap to manufacture. To detachably connect said member to the body or base l so as to provide swiveling motion any suitable construction may be employed. The plug shown has a tubular sleeve whose inner end has threaded connection with rthe threads of the stem 2 and whose bore serves asa passage tor the lead wires and to contain the binding post for the side contact,

i Sleeve 15 has an outwardly extending ange or collar 16 forming a shoulder 1T which together with the shoulder 18 of the body serves to confine the threaded member but yet permit it to rotate on the body and sleeve l5. l

In the plug shown in Figs. 4, 5 and 6 the sleeve l5 ot the first form is omitted and the body 2O and threaded member-2l are detachably connected by a springtongue 22 attached to the smooth stem 23 and having a bent latching portion 2a adapted to spring in behind an inner shoulder 25 o the threaded member smooth stem; rThe end contact and the i manner of connecting it to its cord are the ,same as in the other form.

The side contact, however, comprises the' i. shaped member 26 carrying the binding screw 27 for the lead wire, and a sheet metal member 28 having a ring 29 surrounding and rotatable on and supported bythe stem 23 and one or two spring contact tongues 3() extending longitudinally of the plug and lying in longitudinal grooves 3l in the outer threadedsurfaceo'f member 21. Members 26 and 2S are in electrical contact.

Whenfmember 2l is rotated to screw the "plug into a socket the position ot tongues 30 causes the ring 29 to rotate around the stem 23. There is a certainamount of lost longitudinal motion between the body and threaded member, as a result of which, when `the end contact reachesits seat, the threaded member can be screwed in still further, whereupon the shoulders at the end of grooves y31- engage the spring tongues 30 and bowv the same outwardly into contact with the threaded socket shell, as in dotted lines, Fig. 4t. The parts ol this plug are disl. An attachment plug, comprising a` body and a threaded member on which said which rotates on said infranti body is mounted, said member having exposed threads tor engaging the threaded contact ot an electrical receptacle, said member being formed wholly ot non-corn ducting material, and side and end contacts attached to said body.

2. An attachment plug, comprising a body carrying binding posts 'for two lead wires, side and end contacts electrically connected to said posts, and a threaded member formed wholly of non-conducting material and means whereby said threaded member and body may be readily connected and disconnected with respect to each other, said threaded member having exposed threads for engaging thek threaded contact of an electrical receptacle.

3. A. swivel attachment plug comprising a body portion, a center contact and a wiring terminal supported by said body portion, and a threaded shell of insulating material swiveled on said body portion having exposed threads of insulating material for engaging the threaded shell contact of an elec `trical receptacle, said body portion being insertable into said threaded shell at the.

entering end thereof, 'and means for pren being inserta-ble into said threaded shell at the entering end thereof, and spring means for preventing the withdrawal of said body portion from said swivel shell portion. n

5. A swivel attachment plug comprising a body portion, center and side contacts supported thereby, and a threaded shell swiveled on said body portion having threads for engaging the threaded contact of an electrical receptacle, said body portiongand swivel Shell having a limited relative axial movement, and means whereby said axial movement shifts said side Contact.

6. An attachment` plug comprising a center contact, a threaded shell swiveled with respect to said center contact, having threads for engaging the threads of an elec trical receptacle, said center contact being axially movable with respect to said swivel .2

shell, a side contact and means whereby said axial movement of said center contact will cause movement of said side contact.

7. An attachment plug comprising a threaded shell for screwing into a threaded shell contact of a receptacle, a center contact axially movable with respect to said shell, a Contact carried by and movable on said plug", and meane whereby movement of said center Contact balises movement of said othe` Contact..

8. An attachment plulg` comprising a center Contact, a threaded Shell mounted for swveling and axial movement with respect to said center Contact7 having threads for engaging the threads of a threaded Contact of an electrical receptacle7 a movable Contact carried by said plug 'and means whereby 10 relative axial movement of said center contact and swivel shell aetuates said other Contact.

In testimony whereof I affix my signature.

' ROBESON B; WOLCOTT. 

